Income Taxes (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deferred tax assets:
Allowance for credit losses	$ 5,615	$ 5,272
Depreciation and amortization	29,717	24,312
Federal alternative minimum tax credit		234
State NOL and other state attributes	251	469
State valuation allowance	(355)	(369)
Total deferred tax assets	35,228	29,918
Deferred tax liabilities:
Lease receivable and unearned income	(35,539)	(31,686)
Residual value	(9,670)	(9,315)
Initial direct costs	(418)	(250)
Total deferred tax liabilities	10,399	11,333
Net deferred tax liability	$ (10,399)	$ (11,333)